[llvm] [TableGen][Intrinsics] Add KnownOverloadConflict allowlist for CheckOverloadSuffixConflicts (PR #195698)

[Rahul Joshi via llvm-commits]

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jurahul wrote:

nit: change this to "if intentional, set KnownOverloadConflict = "xxx". Do not prescribe a specific way to do this (via let .. in) as there are other ways to set this value.

https://github.com/llvm/llvm-project/pull/195698